Food Sources

Dairy products, fruits, and vegetables are not very high in thiamin, but when eaten in large amounts, they become a significant source.

Side Effects

A lack or deficiency of thiamin can cause weakness
, fatigue
, psychosis, and nerve damage.

Thiamin deficiency in the United States is most often seen in people who abuse alcohol (alcoholism). A lot of alcohol makes it hard for the body to absorb thiamin from foods. Unless those with alcoholism receive higher-than-normal amounts of thiamin to make up for the difference, the body will not get enough of the substance. This can lead to a disease called beriberi
.

In severe thiamin deficiency, brain damage can occur. One type is called Korsakoff syndrome
. The other is Wernicke's disease
. Either or both of these conditions can occur in the same person.

There is no known poisoning linked to thiamin.

Recommendations

The Recommended Dietary Allowance (RDA) for vitamins reflect how much of each vitamin most people should get each day. The RDA for vitamins may be used as goals for each person.

How much of each vitamin you need depends on your age and gender. Other factors, such as pregnancy and illnesses, are also important. Adults and pregnant or breast-feeding women need higher levels of thiamin than young children.

Dietary Reference Intakes for Thiamin:

Infants

0 - 6 months: 0.2* milligrams per day (mg/day)

7 - 12 months: 0.3* mg/day

*Adequate Intake (AI)

Children

1 - 3 years: 0.5 mg/day

4 - 8 years: 0.6 mg/day

9 - 13 years: 0.9 mg/day

Adolescents and Adults

Males age 14 and older: 1.2 mg/day

Females age 14 to 18 years: 1.0 mg/day

Females age 19 and older: 1.1 mg/day

The best way to get the daily requirement of essential vitamins is to eat a balanced diet that contains a variety of foods.

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